Overthrow check for calculating machines



July 17, 1923. 1,462,061

E. F. BRITTEN. JR

FOR CALCULAFING MACHINES Original Filed Nov, 23, 1920 2 sheets shee't lOGGGQQOG @OOGOOGQGQ v OGQGGGGOQQ OOGGQGOOOG @QOGGGOGGG Q GO QOQOGGOmenu? July 17, 1923.

E. F. BRITTEN. JR

OVERTHROW CHECK FOR CALCULATING MACHINES Original Filed Nov. 23, 1920 2e tst 2 3 vwemtoz Patented July 17, 1923.

UNITED STATES PATENT OFFKTE.

EDWIN F. BRITTEN, TBA, OF MAPLEWOOD,

NEW JERSEY, ASSIGNOR '10 MONROE GAL- CULA'IING MACHINE COMPANY, OF NEWYDRK, N. Y., A CORPORATION OF NEW YORK.

OVERTHBOW CHECK FOR CALCULATING MACHINES.

Original application filed November 23, 1920, Serial No. seams. Dividedand this application filed September 2, 1921.

To all whom it may concern:

Be it known that I, EDWIN F. BRITTEN, J r., a citizen of the UnitedStates of America, resident of Maplewood, in the county of Essex andState of New Jersey, have made a certain new and useful Invention inOverthrow Check for Calculating Machines; and I declare the following tobe a full, clear, and exact description of the same, such as will enableothers skilled in the art to which it appertains to make and use theinvention, reference being had to the accompanying drawings, and toletters or figures of reference marked thereon, which form a part ofthis specification.

Figure 1 is a plan view of a calculating machine embodying theinvention.

Figure 2 is a section on the line 2-2, Fi ure 1.

igure 3 is an enlarged detail side view of the positive over throwcheck, with adjacent parts of the machine.

The invention has relation to means for preventin overthrow of thenumeral wheels of a c'alcu ating machine, under momentum, during theregistering operation, having for an object the provision of improvedmeans for checking the Wheels when subjected to impulses of varyingextent and speed.

Another object is the provision of a positive check which will require aminimum of idle adjustment in the operation of the machine. Otherobjects and advantages will hereinafter appear.

The invention consists in the novel construction and combination ofparts, as here inafter set forth.

in the accompanying drawings illustrating an embodiment of the inventionplied to a machine constructed in accordance W: th the disclosure ofco-penc g plic-ation 426,043, of which the present is divisionalapplication, the nnrnerai 3 resents an operating crank handle, tocommunicate motion to a of eqni n alent gears 2 6, 7:5 and Upon theshalt with 75 is a smailer g meshing with simiiar til mo rigidly upon tor the saloon Serial No. 49?,864.

primary gears 5. These ears 5 are arranged in sets of two, eac setselectively positioned by a series of digital keys and connecting rackbars, as explained in the reissue atent to Baldwin No. 13,841, the teethof each set being arranged in approximately a half-circle, so that thegears 5 may mesh with intermediate gears 12 during approximately ahalf-rotation of shaft 4, the other half rotation of said shaft beingidle. The gears 12 mesh with and operate the gears of the numeral wheels13.

Gear 74 is fast upon shaft 73, to which annuli m are also rigidlyattached, these annuli serving to support laterally movable carryingteeth j, arranged in two oppositely pitched spirals each extendingapproximately one-fourth around shaft 73, a tooth of each spiral seriesbeing adapted to engage its respective intermediate gear 12.Approximately the first quarter rotation of shaft 78 serves to move oneseries of carrying teeth j idly past the cars 12 and corresponds to aportion of t e idle movement of shaft 4. The next half-rotation of shaft73 is also idle, and corresponds to the active or setting-up movement ofshaft 4. The final quarter rotation of shaft 73 brings the teeth j ofthe second series successively into position to act upon theintermediate gears 12, in case of lateral positioning oi the teeth bytheir carrying cams 21; this movement of shaft 73 corresponding theremaining idle movement of shaft 4:, completing the cycle.

Reverse or subtractive rotation of th operating handle 3 will result inthe sem sequence of movements described for for ward or additiverotation, except that said or idle series of carrying teeth 1 will nowopera e, and the second or other es "'Jlll not act,

.111 order to provide for a snthcient oer cit-banks of keys 1n a machineof l consist x J (L J r oitne 5 mos 3 rs a, toe teeth h v:

necessary intervals tlierebetween without rially, provided carryoverthrow checks are employed, made necessary by the carry teeth jmoving more rapidly than the gears 5. Otherwise, where no carryoverthrow checks used, the braking tension of the spring 6 would have tobe increased instead of reduced, in order to check said numeral wheelsagainst overthrow in carry- The carry overthrow checks in the presentcase consist of a series of arms 7 pivoted upon rod 15 and lyng in theplanes of the annuli m at the left-hand side of each tooth j. A camextension 8 of each annulus m acts to throw the related arm 7 toward theintermediate gear immediately upon the completion of the carry action ofthe corresponding carry tooth j, a pin 9 at the end of said arm engagingbetween the teeth of the gear 12 at this time and being held by said camto positively prevent overthrow.

The arms 7 constituting the carry overthrow checks are so mounted upontheir shafts that when the cams 8 move from beneath said arms the latterwill be frictionally held in position upon their'shaft, in engagementwith the intermediate gears, until sa1d gears are rotated in asubsequent operation by the selector gears 5 or carry teeth y', whenthey will be moved from engagement with said gears into the positionshown in Figure 3 of the drawings, where. they will be frictionally'held in position upon their shaft until moved again into engagement withthe gears by the cams 8. This is ofmarked advantage, since should thesearms be held normally in 'contact with the gears 12, as by spring means,the latter would resist movement. of such throughout their actuation bythe selecting and carry elements; while should they be held normally indisengaged position, as by spring means, the latter would resistmovement of all of the carry annuli m once during each rotation ofthecrank, and should they be allowed to drop down through force ofgravityafter action of the cams. 8 thereon, they would noisily vibrate andrattle.

The overthrow checks are so mounted and gears positioned that when theyare thrown to active position by the cams 8, the thrust of the gears 12will be resisted by the supporting shaft 15 or the carry shaft 73,according to the direction of rotation of said gears.

Owing to the fact that the braking tension of the spring 6 is materiallyreduced, the machine is rendered more sensitive, smooth and easyrunning, these advanta s being accentuated by the preservation o auniform tension throughout the cycle of operation.

I claim:

1. In a calculating machine, selecting mechanism including drivingelements, carry mechanism including drivin elements, numeral wheelsoperated by sa1d selecting elements and morerapidly by said carryelements, spring overthrow preventing means for said numeral wheels, andpositively acting overthrow preventing means for said numeral wheelsoperable only during the carry operation.

2. In a calculating machine, selecting mechanism including drivingelements, carry, mechanism including drivin elements, numeral wheelsoperated by SM selecting elements and more rapidly by said carryelements, spring overthrow preventing means for said numeral wheels, andindependent overthrow reventing means for said numeral wh operable onlyduring the carry operation.

3. In a calculating machine, numeral wheels, selecting mechanismincluding driving elements, carry mechanism including a shaft anddriving elements and cams mounted thereon, gears operating the numeralwheels and operated in either direction of rotation by the selectingelements and carry elements, a shaft, overthrow checks mounted thereonand operated by said cams to engage said numeral wheel gears, said carryshaft or said check shaft taking the thrust of said gears, according tothe direction of rotation.

4. In a calculating machine, a numeral wheel, operatingmeans for saidwheel including a gear, an overthrow check adapted to engage said gear,and means for effecting such engagement, said overthrow check beingadapted to'be held in engaged position until moved therefrom by saidgear and in disengaged position until moved therefrom by, said engaging.means.

5. In a calculating machine, a numeral wheel, operating means for saidwheel ineluding a gear, a pivoted overthrow check adapted to engage saidgear, and means for efiecting such engagement, said overthrow checkbeing held frictionally in engaged position until moved therefrom bysaid gear and in disengaged position until moved therefrom by engagingmeans.

6. In a calculating machine, numeral w'heels, selecting mechanismincluding driving elements, carry mechanism including drlving elements,gears operating the numeral wheels and operated by the selectingelements and carry elements, and carryoverthrow checks adapted to engagesaid gears, and means for effecting such engagement, each overthrowcheck being held in-- dependently and frictionally in engaged positionuntil moved therefrom by its re spective gear and in disengaged positionuntil moved therefrom by sald engaging means.

7. In a calculating machine, numeral wheels, selecting mechanismincluding driv-- ing elements, carry mechanism including drivingelements and cams associated therewith, gears operating the numeralwheels and operated by the selecting elements and carry elements, andoverthrow checks for said numeral wheels operable by said cams,

members held frictionally in active or inactive position. I

In testimony whereof I afiix my signature in presence of two witnesses.

EDWIN F. BRITTEN, JR. Witnesses:

P. F. HARNETT, D. RICHARDSON.

